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Volume 54 (1987)
- Issue 4 Pages 625-
- Issue 3 Pages 551-
- Issue 2 Pages 341-
- Issue 1 Pages 1-
Volume 54, Issue 3
Displaying 1-13 of 13 articles from this issue
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Hiroshi Ono1987 Volume 54 Issue 3 Pages 551-558
Published: 1987
Released on J-STAGE: October 27, 2010
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Akiyuki Shinya1987 Volume 54 Issue 3 Pages 559-576
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSthe incidence and duration of the masseteric silent period (SP) during tooth tapping.
Six subjects (5 males and 1 female, 24 to 27 years in age) with normal occlusion and no signs of temporomandibular joint (TMJ) syndrome were investigated. Electromyographic recordings were made from their masseter muscles with bipolar surface electrodes. The TA induced by the occlusal contact during tooth tapping was recorded with an accelero-pickup placed on the forehead of the subject.
The following results and conclusion were obtained: 1. The incidence of the SP decreased according to the decrease of TA. A marked reduction of less than 0. 3 G of TA was observed. 2. The duration of the SP increased according to the decrease of TA. The relationship between the duration of the SP and TA could be approximated with a logarithmic function. 3. The relationship between the TA and the incidence or the duration of the SP can be useful for the diagnosis of the masticatory system and TMJ syndrome.View full abstractDownload PDF (3311K) -
Part 1: Improvement of Castability and Mechanical Properties by Addition of CuOsamu Kohno1987 Volume 54 Issue 3 Pages 577-589
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSThe properties of the Ni-Ti-Cu alloys which replaced a part of Ni by Cu in the Ni-Ti alloy were studied. The Ni-Ti-Cu alloys were cast into the phosphate-bonded silica investment mold by the new casting machine and the mechanical properties, castability and transformation temperature were studied in comparison with those of the binary Ni-Ti alloys.
The following results were obtained:
The Ni-Ti-Cu alloys replacing 8-10at% Ni by Cu showed better properties both in superelasticity and shape memory effect than the original Ni-49.2-49.6at% Ti alloys. The stress level of the Ni-Ti-Cu alloys was lower than that of the original Ni-Ti alloys, but the tensile strength and elongation were adequate for dental application. The reactions between the molten metal and the mold were decreased much by replacing a part of Ni by Cu, and the castability is improved much. Though the level of Ni ion concentration released from the Ni-Ti-Cu alloys in the Ti solution of 0.05%HCl, 1% lactic acid, and 0.09% NaCl was a little higher compared with the Ni-alloys, it was much lower than that of the dental Ni-Cr alloys. A wide application of the Ni-Ti-Cu alloys for dentistry is expected.View full abstractDownload PDF (4153K) -
Kunio Hashiguchi, Kenshiro Takamori, Kenji Hashimoto, Shigetoshi Shiod ...1987 Volume 54 Issue 3 Pages 590-594
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSSince the laser was first developed by Maiman in 1960, the application of laser irradiation with many materials has been studied. Recently, there has been considerable progress in the crystalline structure change of apatite at high temperature. This paper describes about the attempt to study the crystallographic alteration and decomposition product in the human dental enamel powder irradiated by the Nd-YAG laser at an energy density of about 3000J/cm2. In the X-ray diffraction patterns of fused and resolidified enamel powder after Nd-YAG laser irradiation, a few peaks of α-TCP were observed. The irradiation conditions of the laser were as follows:
1) Output of 50W, 10mm in diameter, irradiation time of 0.3 seconds. 40times every 5 minutes.
2) Output of 400W, 4.1mm in diameter, irradiation time of 1 seconds.
α-TCP is the formation of the high temperature phase of apatite .. . But, the X-ray diffraction patterns of the enamel powder exposed to laser at 28J/cm2 for 1 seconds and 28J/cm2 for 108 seconds, showed no changes.View full abstractDownload PDF (989K) -
Yoko Kawaguchi, Masami Yonemitsu, Kihoko Handa, Yoshiyuki Sasaki, Juni ...1987 Volume 54 Issue 3 Pages 595-604
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSAs there are no dentists in Iriomote Island, it is difficult for the inhabitants to have a chance to receive dental treatment because of transportation problems. The Ministry of Health and Welfare and Okinawa Government and eight dental universities cooperated to send a travelling dental clinic to the no-dentist area like Iriomote Island.
We investigated the change in the dental health of the inhabitants in the western areas of Iriomote Island on the basis of seven reports by the travelling dental clinic from 1974 to 1986.
The following results were obtained:
1. In the schoolchidren, as the decayed teeth decreased and the filled teeth increased, the restorative rate of the dental caries increased for twelve years.
2. But no marked difference was found in the caries prevalence and mean DMFT.
3. The brushing habits and oral hygiene of the schoolchildren gradually improved, but no marked difference was found in the adults.
4. The role of the travelling dental clinic was not only providing dental treatment for the inhabitants. It was suggested that it was time to consider it as one part of the comprehensive dental care including prevention and treatment of dental diseases and rehabilitation.View full abstractDownload PDF (1972K) -
Shunsuke Minakuchi, Shuji Ando, Shuji Kondo, Toshiaki Sekita, Ken'ichi ...1987 Volume 54 Issue 3 Pages 605-610
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSWe have been developing a three dimensional measurement system by 35mm non-metric SLR camera and have been applying this system to the measurement of complete denture base surface area and edentulous cast model surface. The purpose of this study was to apply this system to the measurement of the facial form.
The subject's head was fixed and 15 control points were arranged around his face. In order to make the process of stereo-matching easier, we projected mesh on the subject's face and took stereoscopic photographs. These photographs were measured by the digitizer and the 3-D coordinates of about 5000 measuring points were calculated by a personal computer.
The geometric model of the face was displayed in three dimensional computer graphics. And the model of the face was carved out from the acrylic resin by the NC milling machine from these data.View full abstractDownload PDF (2679K) -
[in Japanese]1987 Volume 54 Issue 3 Pages 611
Published: 1987
Released on J-STAGE: October 27, 2010
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[in Japanese], [in Japanese]1987 Volume 54 Issue 3 Pages 612
Published: 1987
Released on J-STAGE: October 27, 2010
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[in Japanese]1987 Volume 54 Issue 3 Pages 613
Published: 1987
Released on J-STAGE: October 27, 2010
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[in Japanese]1987 Volume 54 Issue 3 Pages 614
Published: 1987
Released on J-STAGE: October 27, 2010
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[in Japanese], [in Japanese]1987 Volume 54 Issue 3 Pages 615
Published: 1987
Released on J-STAGE: October 27, 2010
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[in Japanese], [in Japanese]1987 Volume 54 Issue 3 Pages 616
Published: 1987
Released on J-STAGE: October 27, 2010
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[in Japanese], [in Japanese], [in Japanese]1987 Volume 54 Issue 3 Pages 617
Published: 1987
Released on J-STAGE: October 27, 2010
JOURNAL FREE ACCESSDownload PDF (276K)
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